JPS5838522Y2 - cathode ray tube - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cathode ray tube in which a panel and a funnel are joined together to form a vacuum envelope.

In a color picture tube having a color selection electrode, for example, a shadow mask, a shadow mask and an electron gun are built into a glass container, and blue, green, and red phosphors are coated in a well-arranged manner to face the shadow mask.

Three bundles of electron beams emitted from the electron gun pass through the pores of the shadow mask, and then emit light from phosphors of the respective colors, forming an arbitrary colored image.

As shown in FIG. 1, the glass container usually consists of a panel 1 made of a transparent glass material and a funnel 2, both of which are joined by adhesive glass 3.

Incidentally, a color picture tube having such a configuration is normally manufactured in a conventional manner.

First, the shadow mask 4 is assembled and removably attached to the inside of the panel 1, and this assembly is passed through a high-temperature furnace at several 100° C. to remove distortions from the panel 1 and the shadow mask 4.

(This process is called pair baking.

) Next, phosphors of three colors are coated on the inner surface of the panel 1 in dots or stripes to form a phosphor surface 5, and then aluminum is deposited on the phosphor surface 5.

The panel 1 is placed in a high-temperature furnace at several 100° C. for several hours to decompose and remove unnecessary organic substances within the panel 1.

(This process is called panel baking) Next, an adhesive glass 3 called frit glass is applied over the entire sealing surface of the funnel 2 coated with an internal conductive film (not shown).
The panel 1 is fixed to a suitable jig and attached to the funnel 2.
The panel 1 and funnel 2 are then placed on top and passed through a high-temperature furnace at several 100 degrees Celsius to join them together.

(This process is called a frit seal process and requires about 3 to 4 hours of process time).

The purpose of the frit sealing process is mainly to join the panel 1 and the funnel 2, but it also has the effect of thermally decomposing and removing unnecessary organic substances in the tube, especially in the funnel 2.

The adhesive glass 3 normally used for this Furi-jinto seal is 4
It is an inorganic adhesive that solidifies at high temperatures of 00 to 500°C,
Furnace temperature settings must be strictly controlled.

This is because any temperature change has a subtle effect on the voltage resistance, pressure resistance, and sealing properties of the frit seal portion.

After that, the electron gun 7 is sealed in the neck part 6 of the funnel 2, and the gas inside the tube is exhausted while heating the glass container with a well-known exhaust device, and the getter 8 attached to the tip of the electron gun 7 is heated and scattered. and maintain a high vacuum inside the tube.

Thereafter, the cathode portion of the electron gun 7 is heat treated to complete the color picture tube.

Maintaining a high vacuum inside the color picture tube is a necessary condition for long life, and for this reason various heating processes are required as mentioned above, and an inorganic adhesive is used to join the panel 1 and the funnel 2. Therefore, it is desirable that gas emissions in the tube due to electron beam impact or aging be as small as possible.

In order to obtain conventional color picture tubes, it is generally necessary to use a high-temperature furnace in the frit sealing and exhaust processes, and the manufacturing time is also long, resulting in very low productivity and contributing to price increases. It had become.

Conventionally, it was necessary to use a high-temperature furnace in the frit sealing process.As mentioned above, the adhesive glass 3, which is an inorganic adhesive used to bond the panel 1 and the funnel 2, condenses only at high temperatures of 400 to 500°C, and does not congeal at low temperatures. This is because there is no inorganic adhesive that sets.

However, organic polymer adhesives such as epoxy resins can be cured at a much lower temperature and in a shorter time than the adhesive glass 3 described above. If this is used to join the panel 1 and the funnel 2, there is no need to use a high temperature furnace in the frit sealing process, and the manufacturing time can also be shortened.

However, as shown in FIG. 2, the widths 1 and m of the sealing surfaces of the panel 1 and the funnel 2 are almost the same, so the organic polymer adhesive 13 is applied to the entire circumference of the sealing surface of the funnel 2. However, when the panel 1 and the funnel 2 are joined as shown in FIG. 3, the organic polymer adhesive 13 protrudes into and out of the tube.

Since the electron beam from the electron gun 7 scanned by the deflection yoke (not shown) attached to the color picture tube may be excessively deflected, the organic polymer adhesive 13 protruding into the tube as described above may If this occurs, it will be stimulated by the over-deflected electron beam and emit gas, resulting in a decrease in the degree of vacuum within the tube, which will greatly affect the life of the color picture tube.

This idea was made in consideration of these points, and even if an organic polymer adhesive is used to bond the panel and the funnel, unnecessary gas will not be emitted due to the impact of the electron beam, and the manufacturing process will be improved. The object of the present invention is to provide a negative curve tube that can improve productivity by eliminating a high-temperature furnace.

FIG. 4 is a sectional view of essential parts showing an embodiment of the present invention.

In the figure, the panel 1 is made of transparent glass as in the past, but the funnel 2 is made of ceramic.

Further, the panel 1 and the funnel 2 are hermetically bonded all around with an organic polymer adhesive 13.

Furthermore, the sealing surface portion of the funnel 2 protrudes in the pipe inward direction by an appropriate width relative to the sealing surface of the panel 1.

This protruding portion is selected to such an extent that a portion of the electron beam 9 that has been over-deflected to the seal portion does not directly impact the organic polymer adhesive 13 that has protruded into the tube.

Such a protrusion of the sealing surface of the funnel 3 in the tube inward direction does not necessarily have to be provided over the entire circumference; generally, considering the characteristics of the deflection yoke, the deflected electron beam 9 near a part of the corner of the rectangular screen is most excessively deflected. Therefore, the above-mentioned protrusion may be provided only near a part of the corner.

That is, it is sufficient to prevent the over-deflected electron beam 9 from impacting the organic polymer adhesive 13 inside the tube over the entire circumference of the sealing surface.

According to the color picture tube with such a configuration, the organic substances in the panel 1 are thermally decomposed by panel baking as in the past, and the funnel 2 is made of ceramic, which has the advantage of having little adsorbed gas, so it cannot be heated at high temperatures. panel 1 and funnel 2 by taking advantage of this feature.
Since these can be hermetically bonded using the organic polymer adhesive 13, there is no need for high-temperature heating as in the prior art, and as a result, the frit sealing process can be eliminated or greatly simplified.

In addition, low temperature or room temperature exhaust can be expected. Furthermore, in the conventional pair baking furnace, it was necessary to raise the temperature of the subsequent process, that is, panel baking and frit sealing exhaust process, but if the frit sealing process and exhaust process were to be performed at a low temperature, the temperature of the pair baking furnace would naturally increase. The temperature can also be lowered than before.

Of course, there is no fear that the degree of vacuum inside the tube will deteriorate due to over-deflected electron beams after completion, and a sufficient lifespan can be maintained.

FIG. 5 is a cross-sectional view of a main part showing another embodiment of the present invention, in which a seal part of the funnel 2 is made to protrude inwardly to provide a recess 10, and a protrusion 11 is further provided in which the protrusion part is extended in the direction of the panel 1. The organic polymer adhesive 13
is even more securely protected.

FIG. 6 is a sectional view of a main part showing still another embodiment of the present invention,
A part of the electron shield 12, which is generally attached to the bottom surface of the shadow mask 4, is extended largely toward the sealing surface to protect the sealing portion.

In addition to this, various other structures can be considered that satisfy the intent of the present invention.

In short, any structure is sufficient as long as it protects the organic polymer adhesive 13 protruding into the tube from an over-deflected electron beam.

Although the above description is about funnels made of ceramic, it goes without saying that the present invention is effective even when using glass funnels as long as the amount of gas released does not interfere with color picture tubes.

As mentioned above, the gist of the present invention is that even if an organic polymer adhesive is used to join the panel and funnel, the organic polymer adhesive that protrudes into the tube can be protected from over-deflected electron beams, thereby preventing cathode rays. It is an object of the present invention to provide a cathode ray tube that can significantly improve productivity by reducing fuel costs and processing costs by eliminating or greatly simplifying a part of the heating process in the tube manufacturing process.

It goes without saying that the present invention is effective not only for color picture tubes but also for storage tubes and other special picture tubes.

[Brief explanation of drawings]

Figure 1 is a partially cutaway view showing an example of a normal shadow mask type color picture tube, Figure 2 is a sectional view of the main part of the seal before the panel and funnel are sealed, and Figure 3 is the seal between the panel and funnel. FIG. 4 is a cross-sectional view of the main part of the seal part after attachment, FIG. 4 is a cross-sectional view of the main part showing one embodiment of the present invention, and FIGS. 5 and 6 are cross-sectional views of the main part showing other embodiments of the present invention, respectively. It is. In the figure, 1 is a panel, 2 is a funnel, 5 is a fluorescent surface,
6 is a neck part, 7 is an electron gun, 9 is a hyperdeflected electron beam, 1
0 is a depression, 11 is a protrusion, 12 is an electron shield, 1
3 is an organic polymer adhesive. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) A vacuum envelope is constructed by joining a funnel having a neck portion in which an electron gun is housed and a panel having a fluorescent surface that emits light upon impact with an electron beam emitted from the electron gun; In the electron gun that is hermetically sealed by housing the electron gun in the neck portion, the funnel and the panel are bonded with an organic polymer adhesive, and the organic polymer adhesive is attached near the bonding surface. A cathode ray tube characterized in that it is provided with an electron beam shield and armpit portion for preventing the electron beam from hitting the cathode ray tube. (2) The cathode ray tube according to claim 1, wherein the funnel is made of ceramic.